"Davus" would be a demeaning name, I think, only for ancient Romans, so translating "Jack" as "Knave" in Latin might work, since in English it has that laddish meaning (in an antiquated way, as in playing cards).Forsit "Nebulo" vel "Fraudator" pro "Jack" nomine, quod "Jack" est "Knave" (vel sic anglicè velle dicere potest) sicut nomen illius chartae lusoriae.

"Hit the road, Jack" = short short long long (in the rhythm of the song // secundum ictos istius carmenis) "Abī, Abī" = short long short long"Nebulo, abī" (sine synaloephâ // without ellipsis) = short short short short long ≣ short short (short short) long = short short long long